diff options
author | Alex Waterman <alexw@nvidia.com> | 2018-07-02 20:14:27 -0400 |
---|---|---|
committer | mobile promotions <svcmobile_promotions@nvidia.com> | 2018-09-09 20:20:43 -0400 |
commit | 3cf92ec89ba8deac77d726f02d79cba7c0e73e4d (patch) | |
tree | 9b20d30e81ab45d85eddbdf1cdd36901fd5a4ad2 /drivers/gpu/nvgpu/include | |
parent | 2dd9bb03dd56ca86b0e61b89fab38d38a58ecddf (diff) |
gpu: nvgpu: Fix several issues with the buddy allocator
The issues are:
1. Non-fixed allocs must take into account explicit PTE size
requests. Previously the PTE size was determines from the
allocation size which was incorect. To do this, the PTE size
is now plumbed through all GPU VA allocations. This is what
the new alloc_pte() op does.
2. Fix buddy PTE size assignment. This changes a '<=' into a
'<' in the buddy allocation logic. Effectively this is now
leaving the PTE size for buddy blocks equal to the PDE block
size as 'ANY'.
This prevents a buddy block of PDE size which has yet to be
allocated from having a specific PDE size. Without this its
possible to do a fixed alloc that fails unexpectedly due to
mismatching PDE sizes.
Consider two PDE block sized fixed allocs that are contained
in one buddy twice the size of a PDE block. Let's call these
fixed allocs S and B (small and big). Let's assume that two
fixed allocs are done, each targeting S and B, in that order.
With the current logic the first alloc, when we create the
two buddies S and B, causes both S and B to have a PTE size of
SMALL. Now when the second alloc happens we attempt to find
a buddy B with a PTE size of either BIG or ANY. But we cannot
becasue B already has size SMALL. This casues us to appear
like we have a conflicting fixed alloc despite this not being
the case.
3. Misc cleanups & bug fixes:
- Clean up some MISRA issues
- Delete an extraneous unlock that could have caused a
deadlock.
Bug 200105199
Change-Id: Ib5447ec6705a5a289ac0cf3d5e90c79b5d67582d
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1768582
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Diffstat (limited to 'drivers/gpu/nvgpu/include')
-rw-r--r-- | drivers/gpu/nvgpu/include/nvgpu/allocator.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/nvgpu/include/nvgpu/allocator.h b/drivers/gpu/nvgpu/include/nvgpu/allocator.h index 698aafb3..2d9b3d32 100644 --- a/drivers/gpu/nvgpu/include/nvgpu/allocator.h +++ b/drivers/gpu/nvgpu/include/nvgpu/allocator.h | |||
@@ -49,6 +49,8 @@ struct gk20a; | |||
49 | */ | 49 | */ |
50 | struct nvgpu_allocator_ops { | 50 | struct nvgpu_allocator_ops { |
51 | u64 (*alloc)(struct nvgpu_allocator *allocator, u64 len); | 51 | u64 (*alloc)(struct nvgpu_allocator *allocator, u64 len); |
52 | u64 (*alloc_pte)(struct nvgpu_allocator *allocator, u64 len, | ||
53 | u32 page_size); | ||
52 | void (*free)(struct nvgpu_allocator *allocator, u64 addr); | 54 | void (*free)(struct nvgpu_allocator *allocator, u64 addr); |
53 | 55 | ||
54 | /* | 56 | /* |
@@ -242,6 +244,7 @@ int nvgpu_lockless_allocator_init(struct gk20a *g, struct nvgpu_allocator *na, | |||
242 | * Allocator APIs. | 244 | * Allocator APIs. |
243 | */ | 245 | */ |
244 | u64 nvgpu_alloc(struct nvgpu_allocator *allocator, u64 len); | 246 | u64 nvgpu_alloc(struct nvgpu_allocator *allocator, u64 len); |
247 | u64 nvgpu_alloc_pte(struct nvgpu_allocator *a, u64 len, u32 page_size); | ||
245 | void nvgpu_free(struct nvgpu_allocator *allocator, u64 addr); | 248 | void nvgpu_free(struct nvgpu_allocator *allocator, u64 addr); |
246 | 249 | ||
247 | u64 nvgpu_alloc_fixed(struct nvgpu_allocator *allocator, u64 base, u64 len, | 250 | u64 nvgpu_alloc_fixed(struct nvgpu_allocator *allocator, u64 base, u64 len, |